Central Valley Company is a merchandising firm that sells a single product. The company's cronues and expenses for the last three months are presented below: Required: a. Determine which expenses are mixed and, by use of the high-low method, separate each mixed expense into its variable and fixed components. State the cost formula for each mixed expense. (9\%) b. How much will be expected to be incurred for Salaries and Commissions if July sales will be 5,500 units (6%)